Free Number Base Converter
Type a number in any base and the others update live — binary, octal, decimal, hexadecimal.
Frequently Asked Questions
What number bases are supported?
Binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16) — the four most common bases in programming. Edit any field and the others update instantly.
Is there a limit on how large a number can be?
Numbers are handled up to JavaScript's safe integer limit (about 9 quadrillion, or 2^53). Values beyond that lose precision, same as any standard calculator.
Can I enter negative numbers?
Yes — a leading minus sign is accepted in the decimal field and reflected as a signed value in the others.
Is my data sent anywhere?
No. The conversion happens entirely in your browser. Nothing is transmitted or stored.